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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 19 |
| 3 | 388 |
| 4 | 12273 |
| 5 | 528216 |
| 6 | 28824811 |
| 7 | 1907463440 |
| 8 | 148449329825 |
| 9 | 13287501321472 |
| 10 | 1344889039128291 |
| 11 | 151888157696186880 |
| 12 | 18936317798871433681 |
| 13 | 2583256803370493809664 |
| 14 | 382764484828432552194875 |
| 15 | 61215815097927618654693376 |
| 16 | 10510472883169375744953509697 |
| 17 | 1928296235410784800904193638400 |
[1,2,19,388,12273,528216,28824811,1907463440, 148449329825,13287501321472,1344889039128291, 151888157696186880,18936317798871433681, 2583256803370493809664,382764484828432552194875, 61215815097927618654693376, 10510472883169375744953509697, 1928296235410784800904193638400] |